Domain of Dread meeting with Eberron

Hello,

I'm hitting a bit of a DM idea slump here. I've been running a homebrew campaign in Eberron and had this concept of a massive spell having been cast sevral hundred years ago which has slowly been weakening the fabric between realities. Specifically, the Domains of Dread are starting to connect with the world of Eberron via portals. My players have been avoiding exploring Barovia despite the warning that the two realities are beginning to merge on a more overlapping and permanent basis.

I'm looking for some ideas on how Barovia or another Domain merging into Eberron might affect the landscape. I have already done a wild mutation area where mimics have taken over a seemingly abandoned town as well as creatures that look like the crow and rotten stray from Caelid in Elden Ring.

The party is looking to head into a large forested area to get to an elven city where a powerful wizard lives. Any ideas on how to incorporate the merging of Barovia or another Domain into this excursion with the hopes of ramping the sense of urgency to find a solution to the problem would be appreciated (ideally avoiding railroading here).

So far they've encountered the Death House from Curse of Strahd and have been hesitant to go through any more portals.